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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x^3-((2*x)/x)-3 = 0
3*x^3-3-2 = 0
3*x^3 = 5 // : 3
x^3 = 5/3
x^3 = 5/3 // ^ 1/3
x = (5/3)^(1/3)
x = (5/3)^(1/3)
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